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w in (-oo:+oo)
5 = (1/5)*w // - (1/5)*w
5-((1/5)*w) = 0
(-1/5)*w+5 = 0
5-1/5*w = 0 // - 5
-1/5*w = -5 // : -1/5
w = -5/(-1/5)
w = 25
w = 25
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